Explanation

91 is not a prime number because it is divisible by 7 and 13 (91 = 7 × 13).

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers.

Explanation

To find the total number of packages:

Total weight of meat = 100 kg

Weight of each package = 4/7 kg

Number of packages = Total weight / Weight per package

= 100 / (4/7)

= 100 * 7 / 4

= 175

Explanation

3x - 15 - 6 = 0

3x = 21

X = 21/3

X = 7

Explanation

Explanation

Number of boys present: 50% of 100 = 0.5 x 100 = 50 boys

Number of girls present: 40% of 900 = 0.4 x 900 = 360 girls

Total students present = Boys present + Girls present

= 50 + 360

= 410

Now, let's find the percentage of students present:

Total students = Boys + Girls = 100 + 900 = 1000

Percentage of students present = (Total students present / Total students) x 100

= (410 / 1000) x 100

= 41%

Explanation

Multiply the given number by 3, After multiply subtracts 9 from the same number:

6*3=18-9= 9

 9*3=27-9= 18

18*3=54-9= 45

45*3=135-9= 126

126*3=378-9= 369

Explanation

The sequence is 1×2,2×3,3×4,4×5,5×6,6×7,......

Missing number=7×8=56.

Explanation

4404 is divisible by both 3 and 4, making it divisible by 12.

Explanation

To find the average, we need to first convert each fraction to a decimal:

 5/6 = 0.83

 4/3 = 1.33

 3/4 = 0.75

Then, add the decimals and divide by the number of values:

 0.83 + 1.33 + 0.75 = 2.91

 2.91 ÷ 3 = 0.97

Now, convert the average back to a fraction:

 0.97 ≈ 35/36

Explanation

The square of a number is the result of multiplying the number by itself.

In this case, 35 squared (written as 35²) is equal to 35 × 35 = 1225.